Improvement in stereoscopes



` p Vparts of the s tereoscopc lens frame.

i cross-piece e slides upon the bar e2, and is pro- 4vided with afriction-spring, 3, that holds the l UNITED STATES PATENT @OFFICE HENRYJ. LEWIs, oE GREEN POINT, BROOKLYN, NEW YORK, A'ssIcNoR To E. AND E. T.ANTHONY a oo., OE NEW YORK oITY.

IMPROVEMENT IN STEVREOSCOPESA Specication forming part of Letters PatentNo. 165,241, dated July 6, 1875 application filed June 7, 1875.

To all lwhom z't may concern.-

Be it known that I, HENRY J. LEWIs, of Green -Point, Brooklyn, Kingscounty, New York, have invented an Improvement in Folding Graphoscopes,of which the following is a specication The base of the graphoscope ismade to fold and inclose the lens, and the supports for the lens andstereoscopeglasses are constructed so that no portion appears on theoutside of the box when folded. The base contains slides-one for thelarger single pictures, the other for stereoscope-pictures. rBhe base ofthe graphoscope is provided with folding legs, by which the instrumentis connected with a stand, and upon these folding legs the instru mentcan be tipped to any desired inclination and. there held, and when theinstrument is folded the box composing the base closes down upon thestand, and the entire instrument assumes the shape of a box more or lessornamental in its finish, but inclosing all the parts, so that they areexcluded from injury or dust.

In the drawing, Figure l is a section of the instrument as open andready for use. Fig. 2 is a plan of the same with the picture and lensholder turned down. Fig. 3 is a section, showing the instrument asfolded into the box.

The base is made of the two half-boxes a b, hinged together at c, sothat they may be opened out flat, as in Fig. 1, or closed into the boxform, as in Fig. 3. The picture-holder d rests upon rods el, that arehinged to the crosspiece e, that slides within the portion b of thebase, so as to adjust the position of the picture by moving it nearerto, or farther from, `nthe lens f, and raising or lowering the holderand picture, and this holder can fold forward,

as seen in Fig. 3, so as to give room for the The same, in position whenadjusted, and there is a metal cross-piece, with. eyes 2, sliding uponthis rod, and serving to retain the cross-piece at right angles to thebar. The slide m, for the `stereoscope-pictures, is fitted to be movedWithin. the portion a of the base, and it may be `made With theordinaryholding-wires at the endet,` The drawing represents a groove in theslide, into which the bottom of the stereoscope-picture is inserted.This slide m is upon a block, that slides in a groove or mortise in thebottom ofthe box a. The graphoscope-lens f and the stereoscope-glasses'g are in a front piece, gf, that is hinged to the front portion of thebox a, and hence the parts can be folded down into the box a when not inuse 5 and in orderto hold such front piece up when in use I employ thehinged leg o', that is hinged between the wings o, and is turned down torest upon 'the inner surface of the box a, as seen in Fig. l, to holdthe front and lenses in position, and this leg is turned up out of theway when the instrument is folded. The base is supported upon the standn by the folding legs p, thatl are hinged at plto the stand, and at p2to the base a,- and p3 is a strut hinged to the legs p, so that, whenopened into the position shown in Fig. l, the base is firmly supportedtriangularly, and can be tipped to any desired inclination forconvenience in observing the pictures. A strut, t, is` employed forholding up the lens end of the base. This strut is hinged at its upperend to the base u, and its lower end enters one of several notches inthestand n, and the lower end of this strut should be made as a springcatchto grasp one of the cross-bars, or with double spring-catches to entercavities in the stand and prevent the base moving after it is adjusted.

rlhe direction in which the parts-fold will be apparent by an inspectionof Fig. 3, and it Will be seen that there are not any parts lthatproject outside the box formed when the parts are folded.

Locks, catches, or hooks may be used to keep the parts of the boxtogether when folded.

Whenthe parts are unfolded or opened out both the stereoscope andgraphoscope may be made use of in the ordinary manner, and they can beadjusted as easily as the instruments heretofore employed.

I claim as my inventionl. The base for the graphoscope madeof the twoportions u. and b, that are hinged together and form the inclosing-box,substantially as set forth.

2. lllhe rods el for the picture-holder d, hinged at their lower ends tothe cross-bar e, sliding within the base b, in combination with thefriction-spring 3 and eyes 2, tha-t guide the holder when in use,substantially as set forth.

3. The stereoseope-lens frame g', hinged to the front edge of the basea, inl/combination with the hinged leg r at the back of such lensframeg', substantially as set forth.

4. The base a b of the graphosoope, hinged to the stand by a foldingstrut, substantially as set forth.,

5. The pietureholder d, hinged to the sliding cross-piece e, vand thesliding stereosoopeholder m, in combination with the folding lensholdersand box a b, forming the base1 the parts being constructed and arrangedsubstantially as set forth.

Signed by me this 4th day of June7 A. D. 1875.

HENRY J. LEWIS.

Witnesses:

GEO. T. PINGKNEY, OHAs. H. SMITH.

